Judges don't have the ability to do anything at all. The executive branch is the doer. I generally agree that the system is being destabilized; what you are missing is that it's the judges who are doing it because you didn't quite get the nature of their power. The nature of judicial power in our system is to grant or deny political legitimacy to the government. The weakness here is that political legitimacy rests entirely in the minds of the people, and that requires that the people generally perceive judges' rulings as "fair." So if the judges start abusing this power with fantastical, absurd rulings, then the people stop seeing the judiciary as the final authority on which political legitimacy rests. But that is exactly what leftist judges are doing right now, and that, not Donald Trump, is what is destabilizing the system. The less self-aware judges issue rulings like we just saw, where a district court tried to declare that the President has no power to expel foreign invaders from the country without a judge's consent. We've seen a judge rule that the Constitution grants Jim Acosta a personal right to attend White House briefings, and another judge at least float the idea that the President has no power to decide which employees of private news organizations ride with him on Air Force One.